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Method for preparing dry strength agent by UV-induced polymerization

A photoinitiator and ultraviolet light technology, applied in textiles and papermaking, non-fiber pulp addition, papermaking, etc., can solve the problems of high cost of synthetic dry strength agents, too large or too small polymers, gelation, etc. Achieve excellent paper dry strengthening effect, good effect, and prevent gelation effect

Active Publication Date: 2017-10-10
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adding a cross-linking agent is often used to obtain a branched-chain dry strength agent, but there is often a common problem, that is, the problem of controlling the reaction process. The viscosity of the obtained polymer often appears too large or too small, and improper control often causes problems. Gelation occurs
Due to the high price of the various monomers used, the cost of the current synthetic dry strength agent is relatively high

Method used

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  • Method for preparing dry strength agent by UV-induced polymerization
  • Method for preparing dry strength agent by UV-induced polymerization
  • Method for preparing dry strength agent by UV-induced polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 350g of water to the reaction kettle, add 35g of cationic starch under stirring, heat to 75°C for gelatinization for 2 hours, then add 101g of acrylamide, 1g of dimethylacrylamide, 0.6g of ethyl thioglycolate, and 3g of hydroxypropyl acrylate in sequence , 1.5 g of ethyl acrylate and 0.6 g of benzophenone were stirred evenly, and 55 g of water was added to rinse the feeding port, and the reactor was repeatedly evacuated for 2-3 times, and then the nitrogen was maintained, and the temperature of the reactor was raised to 85 ° C. The reaction system was irradiated with ultraviolet light, and reacted for 1.5 hours at a constant temperature. After that, samples were taken every 20 minutes for viscosity testing. After the viscosity reached 7000mP*s, the irradiation of ultraviolet light was stopped, and 0.5g of sulfuric acid (15%) was added to adjust the pH to 4-6, finally add 0.01g of hydroquinone, add water to adjust the solid content to 20±1%, which is the final product...

Embodiment 2

[0029] Add 350g of water to the reaction kettle, add 58g of cationic starch under stirring, heat to 85°C for gelatinization for 1 hour, then add 60g of acrylamide, 0.08g of methylenebisacrylamide, 0.8g of mercaptoethanol, and 15g of hydroxypropyl acrylate in sequence , 5 g of styrene and 0.5 g of benzophenone were stirred evenly, and the feeding port was rinsed with 50 g of water, and the reactor was repeatedly evacuated and nitrogen evacuated for 2-3 times, and then the nitrogen was maintained, and the temperature of the reactor was raised to 75 ° C. The system was irradiated with ultraviolet light, and reacted for 2 hours at a constant temperature. After that, samples were taken every 20 minutes for viscosity testing. After the viscosity reached 5000mP*s, the irradiation of ultraviolet light was stopped, and 0.5g of sulfuric acid (15%) was added to adjust the pH to 4- 6. Finally, add 2g of sodium bisulfite, and add water to adjust the solid content to 20±1%, which is the fina...

Embodiment 3

[0031] Add 450g of water to the reaction kettle, add 40g of cationic starch under stirring, heat to 95°C for gelatinization for 0.5 hours, then add 52g of acrylamide, 0.03g of methylenebisacrylamide, 0.2g of sodium allyl sulfonate, formaldehyde 4g of methyl acrylate, 1g of hydroxypropyl acrylate, 1g of ethyl acrylate and 0.5g of benzophenone were stirred evenly, and the feeding port was rinsed with 70g of water, and the reactor was repeatedly evacuated and nitrogen evacuated for 2-3 times, and then maintained for nitrogen ventilation. , raise the temperature of the reactor to 85°C, irradiate the reaction system with ultraviolet light, and react for 1.5 hours at a constant temperature, and then start to take samples every 20 minutes for viscosity testing. pH to 4-6, finally add 0.01g of p-benzoquinone, add water to adjust the solid content to 15±1%, which is the final product.

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Abstract

The invention provides a method for preparing a dry strength agent by ultraviolet light-induced polymerization, comprising the following steps: mixing cationic starch and water, heating and gelatinizing, and then sequentially adding water, acrylamide, a cross-linking monomer, a chain transfer agent, For other functional monomers and photoinitiators, in an oxygen-free environment, raise the temperature to 70-95°C, irradiate the reaction system with ultraviolet light for 1.5-2 hours, and then take samples at regular intervals for viscosity testing, and the viscosity reaches 4000 After -9000mP*s, stop irradiating ultraviolet light, add a pH regulator to adjust the pH to 4-6, and add a free radical scavenger to obtain the dry strength agent. The dry strength agent synthesized by the method has the characteristics of less dosage, good effect and low cost. It can be used in the production of cardboard paper, corrugated base paper, coated paper, bobbin paper, special paper and other paper types to increase the dry strength of paper, especially when recycled waste paper pulp is used as papermaking raw materials. more significant.

Description

technical field [0001] The invention relates to a method for preparing a dry strength agent by polymerization induced by ultraviolet light. Background technique [0002] Dry strength agent is an important class of chemicals in the paper industry to increase paper strength, and is usually used to compensate for the decrease in paper strength caused by adding fillers or low-grade fibers (such as recycled fibers). Many water-soluble polymers capable of forming hydrogen bonds with fibers can be used as dry strength agents. [0003] In recent years, the utilization rate of waste paper resources in my country has been increasing year by year, and the development potential is huge. However, the increase in the utilization rate of waste paper means the increase in the number of waste paper recycling, which will cause a sharp drop in the paper strength index, so it is necessary to add a dry strength agent to enhance the paper strength. With the increasing demand for paper and paper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08F2/50D21H21/14
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS